Understanding the utility of Projected curves feature and Revolved cut feature in Solidworks

1) Rear Wheel - https://drive.google.com/file/d/1aLqeS571StzAcAbHlpAT9gl9dfApXV0d/view?usp=sharing

2) Front Fork - https://drive.google.com/file/d/1Kwg0ophI5tFA5pOpsfsm7-8cvvqnuO54/view?usp=sharing